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DC Motors

DC Motors
A dc motor can be easily identified by

Winding
Yoke
Commutator
Size of conductor

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DC Motors
In a dc motor if the back emf is absent

Motor will burn
Motor will run at very high speed
Motor will not run at all
Motor will run at very slow speed

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DC Motors
The running speed of a dc series motor is basically determined by

Armature reaction
None of the listed here
Field excitation
Load

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DC Motors
In a D.C. generator, the iron losses mainly take place in

Armature rotor
Yoke
Commutator
Armature conductors

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DC Motors
The direction of rotation of a D.C. series motor can be changed by

Interchanging supply terminals
Interchanging field terminals
Either of (A) and (B) above
None of these

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DC Motors
Which of the following can be used for controlling the speed of a dc motor?

Thyratron
Thyristor
Transistor
Thermistor

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